Perhaps you should try some spelling variations:
day nhanh » day thanh, duy nhanh, dac nhan
pham thuc » phap thuc, pham chuc, nham thuc
day manh » van manh, duc manh, ha manh
cua tre » cua te, cua triet, dua tren
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
ve pham » vi pham, v pham, ve phan
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang x hoi. hieu ve pham thuc ((day manh) or (day nhanh)) de ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x hoi. hieu ve pham thuc ((day manh) OR (day nhanh)) de ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang x hoi. hieu ve pham thuc ((day manh) or (day nhanh)) de ((cua tre) or (cuu tre))*.